I think it would take away from the game if you could just change the difficulty from the settings.
Part of what makes souls games special is that they put a wall in front of you and it’s up to you to figure out how to get past it. You can make it easier on you by asking for help through summons, spirits, improving your build or you can learn how to fight them with what you already have.
I guess I just don’t really resonate with that idea, personally.
In Nine Sols you can turn on story mode and access sliders to adjust the combat however you want. It disables boss achievements. I’m still perfectly able to enjoy the intended experience regardless of what anyone else does.
Coming from someone who buys every fromsoft game day 1 and enjoys them thoroughly as-is, at this point I genuinely think it’s just a marketing thing. Pretty much every other game has accessibility options, and you really never see anyone complaining about it as if it somehow ruined the game for them. On the contrary, other communities are proud of the accessibility options and are glad to welcome all different types of players.
